Parametric mesher

[leon-vv]

• ~Part of a circle on a path~
• ~Higher order meshes~
• ~Correct handling of normals / orientation~
• ~From boundary path~
• Correct export/import to various mesh formats
• Add documentation
• Spline through points
• Translation of mesh size factor
• Fix circular dependency Mesh <-> Geometry
• Size from distance
• PathCollection and SurfaceCollection would be nice

[leon-vv]

The problem of sliths appearing when a transition is made to the next quad subdivision needs to be fixed eventually.

Update: fixed